US20140027042A1 - Method for manufacturing pneumatic tire - Google Patents

Method for manufacturing pneumatic tire Download PDF

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Publication number
US20140027042A1
US20140027042A1 US14/110,346 US201214110346A US2014027042A1 US 20140027042 A1 US20140027042 A1 US 20140027042A1 US 201214110346 A US201214110346 A US 201214110346A US 2014027042 A1 US2014027042 A1 US 2014027042A1
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Prior art keywords
tire
styrene
layer
inner liner
pneumatic tire
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US14/110,346
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English (en)
Inventor
Kenichi Uesaka
Mutsuki Sugimoto
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Assigned to SUMITOMO RUBBER INDUSTRIES, LTD. reassignment SUMITOMO RUBBER INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUGIMOTO, MUTSUKI, UESAKA, KENICHI
Publication of US20140027042A1 publication Critical patent/US20140027042A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0008—Compositions of the inner liner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D2030/0682—Inner liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
    • B60C2005/145—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre made of laminated layers

Definitions

  • the present invention relates to a method for manufacturing a pneumatic tire, and particularly to a method for manufacturing a pneumatic tire in which a polymer layer stack is used for an inner liner.
  • the inner liner is disposed in the radially inner side of a tire to reduce an amount of leakage of air from inside to outside the pneumatic tire.
  • a rubber composition for such an inner liner employs a butyl-based rubber.
  • the butyl-based rubber contains a butyl rubber by 70 mass % to 100 mass and a natural rubber by 30 mass % to 0 mass %. In this way, the tire is provided with improved air permeability resistance.
  • the butyl-based rubber contains isoprene by approximately 1 mass %, which acts with sulfur, vulcanization accelerator, and zinc white to achieve co-crosslinking with adjacent rubber.
  • the above-described butyl-based rubber needs to have a thickness of 0.6 mm to 1.0 mm for a tire of a passenger car, and needs to have a thickness of approximately 1.0 mm to 2.0 mm for a tire of a truck/bus.
  • thermoplastic elastomer having higher air permeability resistance and capable of providing a thinner inner liner than the butyl-based rubber has been proposed.
  • the thermoplastic elastomer having a smaller thickness and exhibiting higher air permeability resistance than the butyl-based rubber is inferior to the butyl-based rubber in terms of vulcanization adhesion strength with an insulation rubber or a carcass rubber adjacent to the inner liner.
  • Patent Document 1 Japanese Patent Laying-Open No. 9-165469 proposes a pneumatic tire in which an inner liner layer is formed using nylon of low air permeability, so that adhesive property between the inner liner and a rubber composition forming the tire inside or a carcass layer can be improved.
  • a nylon film layer a nylon film needs to be subjected to a RFL treatment, and then a rubber cement made of a rubber composition needs to be applied, which complicates the steps.
  • a tire vulcanization method of inserting a bladder body into an unvulcanized tire seated in a mold and expanding the bladder body to press the bladder body against the inner surface of the mold from the inside of the unvulcanized tire for vulcanization molding is generally adopted in a vulcanizing step.
  • the inner liner layer of Patent Document 1 the inner liner layer made of the nylon film layer will come into contact with the bladder in a heated state, so that the inner liner layer will stick and adhere to the bladder. Then, when taking out a vulcanized tire from the mold, the inner liner layer adhering to the bladder remains at the bladder side, with the result that the air-in phenomenon takes place between the inner liner layer and the insulation or the carcass.
  • the present invention provides a method for manufacturing a pneumatic tire in which a polymer layer stack having small thickness and excellent air permeability resistance is used for an inner liner, wherein the inner liner and a bladder are prevented from sticking to each other to avoid bringing about an air-in phenomenon between the inner liner and a carcass.
  • the present invention relates to a method for manufacturing a pneumatic tire, including the steps of preparing a polymer layer stack formed of a first layer made of a styrene-isobutylene-styrene triblock copolymer and having a thickness of 0.05 mm to 0.6 mm and a second layer made of an epoxidized styrene-butadiene-styrene triblock copolymer and having a thickness of 0.01 mm to 0.3 mm, molding a raw tire with the polymer layer stack bonded to an inner side of the tire as an inner liner, arranging the raw tire in a mold and vulcanizing the tire under pressure from a bladder, and cooling a vulcanized tire at 50° C. to 120° C. for 10 seconds to 300 seconds.
  • the step of cooling a vulcanized tire is performed by cooling the inside of the bladder.
  • the step of cooling a vulcanized tire uses, as a coolant, one or more coolants selected from the group consisting of air, water vapor, water, and oil.
  • the first layer of the polymer layer stack is arranged at the radially innermost side of the raw tire, and the second layer of the polymer layer stack is arranged in contact with a carcass layer of the raw tire.
  • the styrene-isobutylene-styrene triblock copolymer used for the first layer has a weight average molecular weight of 50,000 to 400,000 and contains a styrene unit at a content of 10 mass % to 30 mass %.
  • the epoxidized styrene-butadiene-styrene triblock copolymer used for the second layer has a weight average molecular weight of 10,000 to 400,000, and contains a styrene unit at a content of 10 mass % to 30 mass % and an epoxy equivalent of 50 to 1000.
  • a method for manufacturing a pneumatic tire in which a polymer layer stack having small thickness and excellent air permeability resistance is used for an inner liner, wherein the inner liner and a bladder are prevented from sticking to each other to avoid bringing about an air-in phenomenon between the inner liner and a carcass is provided.
  • FIG. 1 is a schematic cross sectional view showing the right half of a pneumatic tire of the present invention.
  • FIG. 1 The structure of a pneumatic tire manufactured using a method for manufacturing a pneumatic tire according to an embodiment of the present invention will be described with reference to FIG. 1 .
  • a pneumatic tire 1 can be used for a passenger car, a track/bus, a heavy vehicle, or the like.
  • Pneumatic tire 1 includes a tread portion 2 , a sidewall portion 3 , and bead portions 4 .
  • a bead core 5 is embedded in each of bead portions 4 .
  • a carcass 6 and a belt layer 7 are disposed.
  • Carcass 6 is provided to extend from one bead portion 4 to the other bead portion, and is folded back at its opposite ends to engage bead cores 5 .
  • Belt layer 7 which is formed of two plies, is disposed outside a crown portion of carcass 6 .
  • An inner liner 9 is disposed inwardly relative to carcass 6 in the tire radial direction, so as to extend from one bead portion 4 to the other bead portion 4 .
  • Belt layer 7 is disposed such that two plies, which are formed of steel cords or cords of aramid fibers or the like, are arranged to allow the cords to cross each other between the plies normally at an angle of 5° to 30° relative to the tire circumferential direction. Further, in the carcass, organic fiber cords such as polyester, nylon, or aramid are arranged at substantially 90° relative to the tire circumferential direction.
  • a bead apex 8 is disposed to extend from the upper end of bead core 5 in the sidewall direction. It is noted that an insulation may be arranged between inner liner 9 and carcass 6 .
  • the method for manufacturing a pneumatic tire of the present invention includes the steps of (1) preparing a polymer layer stack, (2) molding a raw tire with the polymer layer stack bonded to an inner side of the tire as an inner liner, (3) arranging the raw tire in a mold and vulcanizing the tire under pressure from a bladder, and (4) cooling a vulcanized tire at 50° C. to 120° C. for 10 seconds to 300 seconds.
  • the polymer layer stack is formed of a first layer made of a styrene-isobutylene-styrene triblock copolymer and a second layer made of an epoxidized styrene-butadiene-styrene triblock copolymer.
  • the styrene-isobutylene-styrene triblock copolymer (hereinafter, also referred to as “SIBS”) used for the first layer contains an isobutylene block in a molecular chain. Therefore, a polymer film made of the SIBS has excellent air permeability resistance. Further, the molecular structure of the SIBS is completely saturated except aromatic side chain, so that the SIBS is restrained from being deteriorated and hardened, and therefore has excellent durability.
  • SIBS styrene-isobutylene-styrene triblock copolymer
  • the polymer film made of the SIBS has excellent air permeability resistance, an amount of blending a halogenated rubber having a high specific gravity, which has been used conventionally, can be reduced.
  • the SIBS preferably has a weight average molecular weight of 50,000 to 400,000 measured through GPC measurement, in view of flowability, shaping step, rubber elasticity, and the like. If the weight average molecular weight thereof is less than 50,000, tensile strength and tensile elongation may be unfavorably decreased. If the weight average molecular weight thereof exceeds 400,000, extrusion workability may unfavorably become bad.
  • the SIBS generally contains a styrene unit by 10 mass % to 40 mass %.
  • the SIBS preferably contains the styrene unit at a content of 10 mass % to 30 mass %.
  • the SIBS preferably has a molar ratio between the isobutylene unit and the styrene unit (isobutylene unit/styrene unit) of 40/60 to 95/5 in terms of rubber elasticity of the copolymer. It is preferable that in the SIBS, the isobutylene block has a degree of polymerization in a range of approximately 10,000 to 150,000 and the styrene block has a degree of polymerization in a range of approximately 5,000 to 30,000 in view of rubber elasticity and workability.
  • the SIBS can be obtained through a general polymerization method for a vinyl-based compound, such as the living cationic polymerization method (see Japanese Patent Laying-Open No. 62-48704).
  • the SIBS does not have a double bond other than double bond of an aromatic side chain in the molecule. Hence, the SIBS is stable to ultraviolet rays as compared with a polymer having a double bond in the molecule, such as polybutadiene. Accordingly, the SIBS is excellent in weather resistance.
  • the first layer has a thickness of 0.05 mm to 0.6 mm. If the thickness of the first layer is less than 0.05 mm, the first layer may be broken due to pressing pressure when vulcanizing the raw tire in which the polymer layer stack is applied to the inner liner, with the result that an air leakage phenomenon may take place in the resulting tire. On the other hand, if the thickness of the first layer exceeds 0.6 mm, the weight of the tire is increased to result in decreased performance in fuel efficiency. Further, the first layer preferably has a thickness of 0.05 mm to 0.4 mm.
  • the first layer can be formed by forming the SIBS into the form of a film by means of a general method for forming a thermoplastic resin or a thermoplastic elastomer into a film, such as extrusion molding or calender molding.
  • the epoxidized SBS used for the second layer is a thermoplastic elastomer including a polystyrene block as a hard segment and a butadiene block as a soft segment, an unsaturated double bond portion included in the butadiene block having been epoxidized.
  • an “epoxidized SBS layer” means a polymer sheet made of the epoxidized SBS.
  • the epoxidized SBS has the styrene block, and thus has excellent melting adhesive property with the SIBS similarly having a styrene block. Therefore, when vulcanizing the SIBS layer and the epoxidized SBS layer arranged adjacent to each other, a polymer layer stack with the SIBS layer and the epoxidized SBS layer adhering to each other in an excellent manner can be obtained.
  • the epoxidized SBS has the soft segment formed of the butadiene block, and is thus likely to adhere to a rubber component through vulcanization. Therefore, when vulcanizing the epoxidized SBS layer arranged adjacent to a rubber layer forming a carcass or an insulation, for example, the epoxidized SBS layer and the rubber layer can adhere to each other in an excellent manner. Therefore, if the polymer layer stack containing the epoxidized SBS layer is used for the inner liner, adhesive property between the polymer layer stack and the adjacent rubber layer can be improved.
  • the molecular weight of the epoxidized SBS is not particularly limited, but preferably has a weight average molecular weight of 10,000 to 400,000 measured through GPC method, in view of rubber elasticity and moldability. If the weight average molecular weight is less than 10,000, the epoxidized SBS may be too soft and unstable in size. If the weight average molecular weight exceeds 400,000, the epoxidized SBS may be too hard to extrude thin.
  • the epoxidized SBS preferably contains the styrene unit at a content of not less than or equal to 10 mass % and not more than or equal to 30 mass % in view of tackiness, adhesive property and rubber elasticity.
  • the epoxidized SBS preferably has a molar ratio between the butadiene unit and the styrene unit (butadiene unit/styrene unit) of 90/10 to 70/30. It is preferable that in the epoxidized SBS, the butadiene block has a degree of polymerization in a range of approximately 500 to 5,000 and the styrene block has a degree of polymerization in a range of approximately 50 to 1,500 in view of rubber elasticity and handling.
  • the epoxidized SBS preferably has an epoxy equivalent of more than or equal to 50 and less than or equal to 1,000 in view of adhesive property.
  • the second layer has a thickness of more than or equal to 0.01 mm and less than or equal to 0.3 mm. If the thickness of the epoxidized SBS layer used as the second layer is less than 0.01 mm, the epoxidized SBS layer may be broken due to pressing pressure when vulcanizing the raw tire in which the polymer layer stack containing the epoxidized SBS layer is applied to the inner liner, with the result that vulcanization adhesion strength between the SIBS layer and the adjacent rubber layer may be decreased. On the other hand, if the thickness of the epoxidized SBS layer exceeds 0.3 mm, the weight of the tire is increased to possibly result in decreased performance in fuel efficiency.
  • the epoxidized SBS layer preferably has a thickness of more than or equal to 0.05 mm and less than or equal to 0.2 mm.
  • the epoxidized SBS layer can be obtained by means of a general method for forming a thermoplastic elastomer into a sheet, such as extrusion molding or calender molding.
  • the polymer layer stack for an inner liner can be manufactured by the following method, for example.
  • the SIBS or the epoxidized SBS is formed into a sheet by extrusion molding or calender molding to produce an SIBS layer and an epoxidized SBS layer.
  • the SIS layer and the epoxidized SBS layer are bonded together to produce a polymer layer stack.
  • a polymer layer stack can also be produced by subjecting each pellet of the SIBS and the epoxidized SBS to lamination extrusion, such as laminate extrusion or coextrusion.
  • the polymer layer stack is disposed at an inner liner portion of a raw tire.
  • the polymer layer stack is arranged toward the outer side in the tire radial direction such that the second layer of the polymer layer stack comes into contact with carcass 6 .
  • the second layer and carcass 6 can adhere to each other through vulcanization in the tire vulcanizing step. Therefore, in resulting pneumatic tire 1 , inner liner 9 and the rubber layer of carcass 6 adhere to each other in an excellent manner.
  • the pneumatic tire can have excellent air permeability resistance and durability.
  • adhesive strength between inner liner 9 and the insulation can also be improved by arranging the polymer layer stack toward the outer side in the tire radial direction such that the second layer of the polymer layer stack comes into contact with the insulation.
  • the resulting raw tire is fitted in a mold and vulcanized under pressure from a bladder.
  • the bladder is seated in the vulcanization mold.
  • the raw tire is input into the mold which is open.
  • the bladder is located inside the raw tire and has a contracted state. Filling gas causes the bladder to expand. Through this expansion, the raw tire is pressed from the inside toward the mold to be deformed. This deformation is called shaping.
  • the mold is closed, and the internal pressure of the bladder is increased.
  • the raw tire is held between a cavity surface of the mold and the outer surface of the bladder and pressurized. Furthermore, the raw tire is heated by heat conduction from the mold and the bladder. Through pressurization and heating, a rubber composition of the raw tire is brought into a flow state, and air in the mold is moved to be discharged from the mold. Through heating, rubber produces a vulcanization reaction, with the result that a vulcanized tire is obtained.
  • Vulcanization is conducted, for example, at a temperature of 150° C. to 180° C. for 3 minutes to 50 minutes.
  • the vulcanized tire is cooled at a temperature of 50° C. to 120° C. for 10 seconds to 300 seconds.
  • a polymer layer stack formed of the SIBS layer as the first layer and the epoxidized SBS layer as the second layer is used for the inner liner.
  • Each of the SIBS and the epoxidized SBS constituting the polymer layer stack is a thermoplastic elastomer. Therefore, when heated to, for example, 150° C. to 180° C. in the step of obtaining a vulcanized tire, they will be softened or brought into a flow state within the mold.
  • thermoplastic elastomer having been softened or brought into a flow state is likely to be fused with an adjacent component. That is, the inner liner in contact with the outer surface of the expanded bladder will be softened or brought into a flow state by heating, to be fused with the bladder.
  • the inner liner peels off the insulation or the carcass adjacent thereto, causing an air-in phenomenon. Further, the tire itself may be deformed in shape.
  • immediate quenching is conducted at 120° C. or lower for 10 or more seconds without opening the mold so that the bladder is maintained at a high internal pressure.
  • the thermoplastic elastomer used for the inner liner can thereby be solidified.
  • the thermoplastic elastomer is solidified, fusing of the inner liner with the bladder is eliminated, and thus the releasability when removing the vulcanized tire from the mold is improved.
  • the cooling temperature is from 50° C. to 120° C. If the cooling temperature is lower than 50° C., it is necessary to prepare a particular coolant, which may degrade productivity. If the cooling temperature exceeds 120° C., the thermoplastic elastomer may not be sufficiently cooled, which causes the inner liner to remain fused with the bladder when the mold is opened, giving rise to an air-in phenomenon. In view of solidifying the thermoplastic elastomer at its softening point or below, the cooling temperature is preferably from 70° C. to 100° C.
  • the cooling time is from 10 seconds to 300 seconds. If the cooling time is shorter than 10 seconds, the thermoplastic elastomer may not be sufficiently cooled, which causes the inner liner to remain fused with the bladder when the mold is opened, giving rise to an air-in phenomenon. If the cooling time exceeds 300 seconds, productivity is degraded. In view of compatibility between softening of the thermoplastic elastomer and productivity, the cooling time is preferably from 30 seconds to 180 seconds.
  • the step of cooling a vulcanized tire is preferably performed by cooling inside the bladder. Since a cavity exists inside the bladder, it is possible to introduce a coolant adjusted to the cooling temperature into the bladder after completion of the vulcanizing step. Alternatively, the step of cooling a vulcanized tire can be performed by providing a cooling structure in the mold in addition to cooling inside the bladder.
  • coolant for use in the cooling step, one or more coolants selected from the group consisting of air, water vapor, water, and oil. Of these, water having excellent cooling efficiency is preferably used.
  • SIBS styrene-isobutylene-styrene triblock copolymer; weight average molecular weight: 100,000, the content of the styrene unit: 25 mass %; Shore A hardness: 25) provided by Kaneka Corporation was prepared.
  • Epofriend A1020 an epoxidized styrene-butadiene-styrene triblock copolymer; weight average molecular weight: 100,000; epoxy equivalent: 500 provided by Daicel Chemical Industries Ltd was prepared.
  • the above-described SIBS and the epoxidized SBS were pelletized using a biaxial extruder (screw diameter: ⁇ 50 mm; L/D: 30; cylinder temperature: 220° C.).
  • the obtained pellets were subjected to coextrusion using a T-die extruder (screw diameter: ⁇ 80 mm; L/D: 50; die grip width: 500 mm; cylinder temperature: 220° C.) to obtain the first and second layers.
  • a polymer layer stack having the thickness shown in Table 2 was produced.
  • Comparative Example 1 90 parts by mass of chlorobutyl (“Exxon Chlorobutyl 1068” manufactured by Exxon Mobil Corporation), 10 parts by mass of a natural rubber (NR, TSR20) and 50 parts by mass of a filler (“SEAST V” (N660, nitrogen-adsorption specific surface area: 27 m 2 /g) manufactured by Tokai
  • the resulting polymer layer stack was applied to the inner liner portion of the tire to prepare a raw tire. It is noted that the polymer layer stack is arranged such that the SIBS layer as the first layer of the polymer layer stack is disposed at the radially innermost side of the raw tire and the epoxidized SBS layer as the second layer comes into contact with the carcass layer of the raw tire.
  • the raw tire was arranged in the mold and subjected to press molding at 170° C. for 20 minutes to manufacture a vulcanized tire of size of 195/65R15.
  • the vulcanized tire was removed from the mold. Thereafter, water having a water temperature adjusted to the cooling temperature shown in Table 2 was introduced into the bladder to cool the vulcanized tire. After the lapse of the cooling time shown in Table 2, the vulcanized tire was removed from the mold.
  • Tire productivity means manufacturing efficiency based on the number of tires produced per hour, and evaluations were made on the following criteria.
  • Each manufactured pneumatic tire of size of 195/65R15 was assembled to a JIS specification rim 15 ⁇ 6JJ, and a rolling resistance tester provided by Kobe Steel Ltd was used to measure rolling resistance thereof while performing traveling at a room temperature (38° C.) under conditions of a load of 3.4 kN, an air pressure of 230 kPa, and a speed of 80 km/h.
  • a rolling resistance tester provided by Kobe Steel Ltd
  • rolling resistance of Example 1 was expressed in an index by the following expression. As the value is larger, the rolling resistance is further reduced.
  • Each manufactured pneumatic tire of size of 195/65R15 was assembled to a JIS specification rim 15 ⁇ 6JJ, and air was introduced thereinto at an initial air pressure of 300 Kpa. Then, the tire was left for 90 days at a room temperature. Then, decreasing ratio of air pressure was calculated.
  • Each of combinations of Examples 1 and 2, Examples 3 and 4, Examples 5 and 6, and Examples 7 and 8 is a combination in the case where the cooling time was set at 10 seconds and 300 seconds, respectively. Examples are shown in which four combinations were implemented varying the thicknesses of the first and second layers of the polymer layer stack.
  • Comparative Example 1 is an example where chlorobutyl was used for the inner liner.
  • Comparative Examples 2 and 3 are examples where the inner liner is formed only of the first layer.
  • Comparative Example 4 is the case where the first layer of the polymer layer stack has a small thickness of 0.04 mm.
  • Comparative Example 5 is the case where the cooling temperature for the tire was as high as 130° C.
  • Examples of the present invention are excellent overall in tire productivity, presence or absence of air-in portions, flection crack growth resistance, rolling resistance, and static air pressure decreasing ratio, as compared with Comparative Examples 1 to 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Tires In General (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Tyre Moulding (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
US14/110,346 2011-05-13 2012-02-28 Method for manufacturing pneumatic tire Abandoned US20140027042A1 (en)

Applications Claiming Priority (3)

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JP2011108481A JP5068875B1 (ja) 2011-05-13 2011-05-13 空気入りタイヤの製造方法
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BR112013029035A2 (pt) 2017-01-10
EP2684661A4 (en) 2014-10-08

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